Baiyun movement: A significant tectonic event on Oligocene/Miocene boundary in the northern South China Sea and its regional implications

Pang, Xiong; Chen, Changmin; Zhu, Maoyan; He, Manchao; Shen, Jun; Lian, Shiyong; Wu, Xiangjie; Shao, Lei

doi:10.1007/s12583-009-0005-4

Cited by 91 publications

(65 citation statements)

References 10 publications

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“…The succession of benthic faunas from ODP Site 1148 show a drastic deepening from the upper bathyal (<1500 m) in the Early Oligocene to lower bathyal (>2500 m) in the early Miocene [85]. A similar trend was observed in the sediment sequence from the Baiyun Depression on the modern upper slope, indicating a transition from shallow to deep water conditions [86]. Other concurring changes include abrupt reductions of opal and carbonate accumulation rates, and a sediment source shift from the southern to the northern provenance after the event [13].…”

Section: Sedimentological Response To Basin Evolutionsupporting

confidence: 65%

Tracing the life history of a marginal sea—On “The South China Sea Deep” Research Program

Wang

2012

Chin. Sci. Bull.

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the first large-scale basic-research program in ocean science in the country aiming to reconstruct the life history of a marginal sea. The overall scientific objective of the program is to dissect this typical marginal sea by studying its history of evolution and its modern processes, including the following three major components: (1) Development of the deep basin: utilizing new techniques to re-measure magnetic anomaly lineations, to explore the deep tectonic features, to drill the oceanic crust, and to study volcanic seamount chains; (2) deep-water sediments: observing the modern processes to reveal the patterns of deep-water circulations and sedimentation, analyzing deep-sea sediments to recognize paleoceanographic response to basin evolution, and subsequently to bridge the modern and paleo-studies of the deep-sea processes; and (3) biogeochemical processes: using a variety of techniques including deploying submarine observation and deep-water diving device to investigate the distribution patterns and environmental impacts of deepwater seepages and subbottom circulation, and to reveal the role of microbes in deep-sea carbon cycling. As compared with the open ocean and other marginal seas, the South China Sea enjoys many more advantages as a marine basin for reconstructing the life history. Meanwhile, the South China Sea Deep Program provides unique opportunities in studying the evolution and variations of the sea-land interactions between the Pacific and Asia.the South China Sea Deep, marginal sea, deep-sea process, life history, tectonic evolution, sedimentological response, biogeochemistry Citation:Wang P X. Tracing the life history of a marginal

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Section: Sedimentological Response To Basin Evolutionsupporting

confidence: 65%

Tracing the life history of a marginal sea—On “The South China Sea Deep” Research Program

Wang

2012

Chin. Sci. Bull.

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“…6h-j, 7d). Pang et al (2009) suggested that a strong tectonic movement occurred at the Miocene/Oligocene boundary and called it as the Baiyun Movement. At this movement the Baiyun Sag strongly subsided and changed from continental shelf to continental slope environment abruptly with an abrupt northward jump of the shelf break.…”

Section: Discussionmentioning

confidence: 99%

Cenozoic sedimentary evolution of deepwater sags in the Pearl River Mouth Basin, northern South China Sea

et al. 2013

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Recent exploration revealed the high potential for hydrocarbon in the deepwater sags, Pearl River Mouth Basin, northern South China Sea. This paper reports its Cenozoic sedimentary evolution through backstripping of high precision depth data of interpreted sequence boundaries. Local backstripping parameters were mapped based on well and geophysical data. Sensitivity analysis indicates that the reliability of decompaction results were largely improved by using the local porosity parameters and the lithological parameters that vary with grid nodes. Maps of sedimentation rates of 17 sequences from 65 Ma to the present were constructed, showing the spatial-temporal variation of the sedimentation rate. Three rapid depositional stages, 65-32, 29-23.3, 18.5-10.5 Ma, and three slow depositional stages, 32-29, 23.3-18.5, 10.5-0 Ma, were identified with abrupt changes of sedimentary patterns. The three rapid depositional stages were in accord with syn-rifting stage, the first post-rifting depositional stage, and the second post-rifting depositional stage, respectively. And the three slow depositional stages were in keeping with three tectonic events respectively. Several significant sedimentary discontinuities at 32, 23.3 and 10.5 Ma were observed and discussed. The comparison between the study area and the ODP Site 1148 at 32-23.3 Ma indicates that before *29 Ma the ODP Site 1148 was at similar sedimentation regime as that in the Baiyun and Liwan sags, but significant diversity appeared after *29 Ma, when a large quantity of terrigenous sediments was trapped by strong post-rifting subsidence in the Baiyun and Liwan sags and could not reach the lower slope areas. Study revealed that the most rapid accumulation from 18.5 to 17.5 Ma might be mainly owing to the large sediment supply during this strong monsoon period.

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“…Pang et al [23] considered that the shelf break lay on the south of Baiyun sag before 23 Ma, and kept on the north of Baiyun sag, the similar location to the present, after 23 Ma, which indicated that 23 Ma should be an important tectonic transition time and correspond to the tectonic event, named "Baiyun Movement". Some scholars [32] figured that the spreading ridge had ever transit southwards during 24 to 21 Ma, which aroused the acceleration of seafloor spreading from 30.54 km/ Ma early up to 42.88 km/Ma late [33] .…”

Section: Discussion On the Prolongation Mechanism Of Syn-rift Stagementioning

confidence: 99%

“…Generally, paleo-water depth is negligible for the alluvial-fluvial sediments, 20-200 m for the shore-neritic sediments, 200-500 m for the upper slope and 500-2000 m for the turbidite on the lower slope and abyssal plain [18] . Besides, referring to the latest study, the shelf break zone lay on the southern side of Baiyun sag before 23 Ma and then switched to the current location [23] . All the information could help to estimate the paleo-water depth.…”

Section: Paleo-water Depth and Sea Level Changementioning

confidence: 99%

Rifting process and formation mechanisms of syn-rift stage prolongation in the deepwater basin, northern South China Sea

Dong

Zhang

et al. 2008

Chin. Sci. Bull.

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Based on the latest seismic and geological data, tectonic subsidence of three seismic lines in the deepwater area of Pearl River Mouth Basin (PRMB), the northern South China Sea (SCS), is calculated. The result shows that the rifting process of study area is different from the typical passive continental margin basin. Although the seafloor spreading of SCS initiated at 32 Ma, the tectonic subsidence rate does not decrease but increases instead, and then decreases at about 23 Ma, which indicates that the rifting continued after the onset of seafloor spreading until about 23 Ma. The formation thickness exhibits the same phenomenon, that is the syn-rift stage prolonged and the post-rift thermal subsidence delayed. The formation mechanisms are supposed to be three: (1) the lithospheric rigidity of the northern SCS is weak and its ductility is relatively strong, which delayed the strain relaxation resulting from the seafloor spreading; (2) the differential layered independent extension of the lithosphere may be one reason for the delay of post-rift stage; and (3) the southward transition of SCS spreading ridge during 24 to 21 Ma and the corresponding acceleration of seafloor spreading rate then triggered the initiation of large-scale thermal subsidence in the study area at about 23 Ma.

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Baiyun movement: A significant tectonic event on Oligocene/Miocene boundary in the northern South China Sea and its regional implications

Cited by 91 publications

References 10 publications

Tracing the life history of a marginal sea—On “The South China Sea Deep” Research Program

Tracing the life history of a marginal sea—On “The South China Sea Deep” Research Program

Cenozoic sedimentary evolution of deepwater sags in the Pearl River Mouth Basin, northern South China Sea

Rifting process and formation mechanisms of syn-rift stage prolongation in the deepwater basin, northern South China Sea

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